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The definition of sustained winds recommended by the World Meteorological Organization (WMO) and used by most weather agencies is that of a 10-minute average at a height of 10 m (33 ft) above the sea surface. However, the Saffir–Simpson hurricane scale is based on wind speed measurements averaged over a 1-minute period, at 10 m (33 ft).
The scale separates hurricanes into five different categories based on wind. The U.S. National Hurricane Center classifies hurricanes of Category 3 and above as major hurricanes. The Joint Typhoon Warning Center classifies typhoons of 150 mph (240 km/h) or greater (strong Category 4 and Category 5) as super typhoons.
Once the system's maximum sustained winds reach wind speeds of 64 knots (74 mph; 119 km/h), the JMA will designate the tropical cyclone as a typhoon—the highest category on its scale. [19] Since 2009 the Hong Kong Observatory has divided typhoons into three different classifications: typhoon, severe typhoon and super typhoon. [20]
Typhoon Haiyan (Yolanda) on November 7, 2013, one of the strongest Pacific typhoons ever recorded.. Since 1947, the Joint Typhoon Warning Center (JTWC) has classified all typhoons in the Northwestern Pacific Ocean with wind speeds of at least 130 knots (67 m/s; 150 mph; 240 km/h)—the equivalent of a strong Category 4 on the Saffir–Simpson scale, as super typhoons. [1]
Violent typhoon is the highest category used by the Japan Meteorological Agency (JMA) to classify tropical cyclones in the Northwest Pacific basin. The basin is limited to the north of the equator between the 100th meridian east and the 180th meridian .
Typhoon Man-yi, known as Pepito in the Philippines, is now the equivalent of a Category 2 hurricane (96-109 mph/154-176 km/h) on the Saffir-Simpson Hurricane Wind Scale and will continue to ...
The Saffir–Simpson hurricane wind scale is a classification used for some Western Hemisphere tropical cyclones. Hong Kong has similar official five-level definition warning signals, which use descriptions of winds taken from the Beaufort Scale. The Hong Kong levels, however, do not correspond to the Beaufort Scale, which has 12 levels.
Typhoon Morakot approaching Taiwan in August 2009. A strong typhoon is the lowest category used by the Japan Meteorological Agency (JMA) to classify tropical cyclones that has reached typhoon intensity in the Northwest Pacific basin. The basin is limited to the north of the equator between the 100th meridian east and the 180th meridian.